Sensitivity of Polymer Crystallization to Shear at Low and High Supercooling of the Melt

被引:49
|
作者
Rhoades, Alicyn M. [1 ]
Gohn, Anne M. [1 ,2 ]
Seo, Jiho [3 ]
Androsch, Rene [2 ]
Colby, Ralph H. [3 ]
机构
[1] Penn State Univ, Behrend Coll, 4701 Coll Dr, Erie, PA 16563 USA
[2] Martin Luther Univ Halle Wittenberg, Interdisciplinary Ctr Transfer Oriented Res Nat S, D-06009 Halle, Germany
[3] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA
基金
美国国家科学基金会;
关键词
FLOW-INDUCED CRYSTALLIZATION; PHASE NUCLEATING-AGENT; FLASH DSC 1; ISOTACTIC POLYPROPYLENE; SHISH-KEBAB; MOLECULAR-WEIGHT; CRYSTAL NUCLEATION; CALORIMETRY; ORIENTATION; TEMPERATURE;
D O I
10.1021/acs.macromol.8b00195
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Flow-induced crystallization (FIC) is a dominant mechanism of polymer self-assembly, but the process is poorly understood at high supercooling and under fast cooling conditions because of structural rearrangements that occur during slow heating and cooling conditions typically used for investigation. Incorporating fast-scanning chip calorimetry techniques, the influence that specific amounts of shear flow have on the subsequent crystallization of polyamide 66 over a wide range of temperatures, 85-240 degrees C, is determined. At high temperatures, heterogeneous nucleation dominates and crystallization rate increases with increasing shear. Low-temperature crystallization, driven by homogeneous nucleation, is not influenced by previous shear flow, but sheared samples are able to crystallize via the heterogeneous nucleation route at temperatures 15 K lower than unsheared materials. The magnitude of previous shear flow also dictates alpha-/gamma-crystalline phase development and crystallization during cooling at rates below 200 K/s. This approach provides a route to develop important thermodynamic and kinetic insights that describe the crystallization behavior of many important polymers to enable the advanced engineering of polymer processing and injection molding applications, where practical cooling rates typically range between 10 K/s and 1000 K/s.
引用
收藏
页码:2785 / 2795
页数:11
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